Fuel injection control system

Abstract

Embodiments of the invention enhance the starting performance of an engine from an automatic stoppage state, in a vehicle with an automatic engine stopping and starting system mounted thereon. In an embodiment, an engine start judging unit detects the presence or absence of a vehicle starting operation on the basis of the status of a throttle switch in an automatic stoppage state of an engine, and, when the seating of the driver is confirmed based on the status of a seat switch, the engine is started. A basic injection amount calculating unit calculates a basic fuel injection amount T i on the basis of engine parameters such as the engine cooling water temperature T W and the engine speed N e . An injection amount increasing unit performs a control to increase the fuel injection amount at the time of starting the engine from the automatic stoppage state of the engine, based on the throttle opening detected by a throttle sensor.

1. A fuel injection control system for a vehicle having a throttle and an automatic engine stopping and starting system comprising:
 a throttle sensor for detecting throttle opening, 
 engine start judging means, for starting the engine in response to throttle opening after automatic stoppage of the engine, 
 basic injection amount calculating means, for calculating a basic fuel injection amount on the basis of predetermined engine parameters, and 
 injection amount increasing means for increasing the fuel injection amount at the time of starting the engine from the automatic stoppage state of the engine, based on throttle opening. 
 
     
     
       2. The fuel injection control system of  claim 1 , further comprising:
 injection amount decreasing means for decreasing the fuel injection amount on the basis of the throttle opening at the time of starting the engine from a state other than from the automatic stoppage state of the engine. 
 
     
     
       3. The fuel injection control system of  claim 2 , wherein the injection amount increasing means comprises:
 an injection amount increase table comprising the relationship between the throttle opening at the engine starting time and an injection amount increase coefficient, 
 means for obtaining an injection amount increase coefficient on the basis of the throttle opening and the injection amount increase table, and 
 calculating means for setting a new basic injection amount as the result of multiplying the basic injection amount by the injection amount increase coefficient. 
 
     
     
       4. The fuel injection control system of  claim 2 , wherein the throttle opening at which the increase of the injection amount is started is smaller than the throttle opening at which the decrease of the injection amount is started. 
     
     
       5. The fuel injection control system of  claim 4 , wherein the throttle opening at which the increase of the injection amount is started is about 25% open and the throttle opening at which the decrease of the injection amount is started is about 50% open. 
     
     
       6. The fuel injection control system of  claim 1 , wherein the vehicle is a two-wheeled, single-cylinder vehicle. 
     
     
       7. The fuel injection control system of  claim 1 , further comprising a seat switch, wherein the seat switch has a loaded position and an unloaded position, wherein the engine start judging means only starts the engine in response to throttle opening when the seat switch is in the loaded position. 
     
     
       8. A fuel injection control system for a vehicle with an automatic engine stopping and starting system mounted thereon for automatically stopping an engine in response to a predetermined vehicle stopping condition and thereafter restarting the engine in response to a predetermined vehicle starting operation, the fuel injection control system comprising:
 a throttle sensor for detecting the throttle opening, 
 engine start judging means for starting the engine in response to a throttle opening operation during automatic stoppage of the engine, 
 basic injection amount calculating means for calculating a basic fuel injection amount on the basis of predetermined engine parameters, 
 injection amount decreasing means for decreasing the fuel injection amount at the time of starting the engine, and 
 injection amount decrease prohibition means for prohibiting decrease of the fuel injection amount at the time of starting the engine from an automatic stoppage state of the engine. 
 
     
     
       9. The fuel injection control system of  claim 8 , the predetermined engine parameters comprising engine cooling water temperature and engine speed. 
     
     
       10. The fuel injection control system of  claim 8 , wherein the vehicle is a two-wheeled, single-cylinder vehicle. 
     
     
       11. The fuel injection control system of  claim 8 , further comprising a seat switch, wherein the seat switch has a loaded position and an unloaded position, wherein the engine start judging means only starts the engine in response to throttle opening when the seat switch is in the loaded position. 
     
     
       12. A method for controlling the injection amount of a fuel supplied to an engine attached to a vehicle having an automatic engine stopping and starting system, comprising:
 sensing throttle opening; 
 sensing pre-determined conditions; 
 calculating a basic fuel injection amount; 
 determining the stoppage state of the engine; and 
 adjusting the basic fuel injection amount at the time of starting the engine from the automatic stoppage state of the engine, based on throttle opening. 
 
     
     
       13. The method of  claim 12 , wherein the predetermined conditions comprise engine cooling water temperature and engine speed. 
     
     
       14. The method of  claim 12 , wherein adjusting the basic fuel injection amount in response to the stoppage state of the engine, comprises increasing the fuel injection amount when an automatic stoppage state is detected. 
     
     
       15. The method of  claim 12 , wherein adjusting the basic fuel injection amount in response to the stoppage state of the engine, comprises decreasing the fuel injection amount when a non-automatic stoppage state is detected. 
     
     
       16. The method of  claim 12 , further comprising the step of cranking the engine. 
     
     
       17. The method of  claim 16 , the vehicle comprising a seat switch having a loaded position and an unloaded position, wherein the step of cranking the engine is only performed when the seat switch is in the loaded position. 
     
     
       18. The method of  claim 12 , wherein the vehicle is a two-wheeled, single-cylinder vehicle.